Grating



Jan. 4,1927. 1,612,977

J. A. LUNDSTEADY GRATING Filed April 2. 1926 2 5 Hlll /5 Q h l my "I II7, 73

' JofizzA Lzziggi Patented Jan. 4, 1927. f

UNITED STATES JOHN A. Lmms'rmm, or mrw vonx, 1v: Y.-

GRAEING.

Application filed April 8, 1928. Serial No. 88,348.

This invention relates to improvements in gratings and is especiallyadapted for subway coverings for ventilating purposes, although the samemay be easily useful for 6 any other purpose for which gratings areused.

The primary object of the invention rcsides in a grating in which partsconstituting the grating co-act to'provide an even tread'surface overwhich hand trucks and the like may pass without subjecting the same toundue shock.

Another object of the invention is the provision of a grating which isconstructed of a plurality of separable'partswhich co-actto provide aneven treadsurface, and means for removably locking the parts inassembled position so as to permit of the removal of any of the parts inthe event of damage or wear to the same.

f A further object is to provide a grating of great strength andrigidity and which may be constructed at a minimum cost bothas tomaterial and labor. With these and other objects in view, the

invention resides in certain novel construction and combination andarrangement of parts the essential features of which are hereinafterfully described, are particularly pointed out in the appended claims,and are illustrated in the accompanying drawing, in which Figure 1 is atop plan view of my improved grating, Figure 2 is a vertical lonitudinal sectional view on the line 22 of igure 1.

Figure 3 is a vertical transverse sectional view on the line 3-3 ofFigure 2.

Figure 4 is a detail perspective view of one of the tie bars. Figure 5is a detail perspective view of one of the -ring members.

Figure 6 is a detail sectional view of aslight modification. Referringmore particularly to the drawing, the reference numeral 10 designates mimproved grating in its, entirety and whic includes a plurality ofequi-distantly spaced longitudinal tie bars 11 which are provided withsuitable spaced notches or slots 12 which open on to the upper edge ofthe same. The notches or slots 12 of one bar are staggered with respectto the next adjacent bar,

but are in alignment with the notches in" every other bar for a purposenow to be explained.

Supported by the tie bars in transverse 4 rows are inserts in thenature'of ring mem bers 13, having diametrically o posed slots 14therein which open on to the ottom edge of the ring members. The ringmembers are of such diameter as to fit down over the respective tie barswith the slots 12 of the tie bars receiving the ring member and theslots 14 in the ring members receiving the tie bars. Briefly the ringsinterlock with the tie bars to prevent circumferential creeping of thesame, and when in such position the top edges of the ring members andthe top edges of the tie bars are in perfect alignment. The members 13which interlock with the outer longitudinal tie bars are semi-circularin plan view, in order that a perfectly straight wall may be provided.

For the purpose of locking the members 13 and 13 and tie bars inassembled position, I provide the tie bars with transversely alignedopenings 15 with which diametrically opposed openings 16 in the membersautomatically align when the members are fitted into position upon thetie bars. The openings 15 and 16 pass through the bars and ring membersat the top edge of the same, so that the key or lock bar 17 will readilypass through the aligned openings in such manner that the top surface ofthe lock bars are flush with the top edges of the tie bars and ringmembers. It will therefore be seen that the top faces of all of theparts are flush which affords a-relatively even tread surface to allowtruck wheels and the like to pass over without causing undue vibrationof the truck. The segmental openings in the grate are of such size asnot to permit a shoe heel to become caught, but provides sufiicient openspace for ventilating pur- Doses.

Should it become necssary to remove any of the ring members due to wear,the lock bar'which may be engaging that particular member is withdrawnfrom the registering openings, whereupon the ring members may be liftedout of place and readily replaced by new ones. grating would beconstructed of a plurality of units such as shown in the drawing.

In Figure 6 of the drawing, I have shown a slightly modified form of.lock bar 17 which is square in cross section instead of round This barpasses through square In practice, a relatively large openings in thetie bars and rings, so that one of the sharp pornersof the lock baris ofthe ring and the bars eretofore n1em1oned.,-

\Vhile I have described what I deem to be the most desirable embodimentof my invention, it is obvious that many of the details may be variedwithout in any way dcparting from the spirit of my invention, and Itherefore do not limitmyself to the exact details of construction hereinset forth nor to an thing less than the whole of my invention imitedonly by the appended claims.

What is claimed as new is:

1..A grating comprising a plurality of parallel tie bars, transverserows of members supported by said tie bars, and lock bars passingthrough the respective rows of members and tie bars for locking saidmembers with said tie bars, the u per surfaces of said tie bars, memberand ock bars being flush with respect to each other. a 2. A'- gratingcomprising a plurality of spaced arallel tie bars, transverse rows ofrelative y open members, each row of said members bemg staggered withrespect to the nextadjacent row, interlocking means between said tiebars and said members, and a lock bar passing through each row ofmembers and tie bars, the upper surfaces of said tie bars, members, andlock bars being flush with respect to each other.

3. A grating eomprisin a plurality of spaced parallel tie bars avingslots extending inwardly from their top edges, ring members havingdiametrically opposed slots therein registerim with the slots in saidtie .bars, the slotsbemg of depth as todispose diametrically opposedslots therein rcgistering with the slots in the bars and diametricallyopposed openings disposed at right angle to said slots for automaticallyregistering with the openings in said tie bais when the ring members arein position thereon, and lock bars passing through the registeringopenings in said tie bars and ring members.

5. A grating comprising a plurality of parallel tie bars, continuousbands supported by said tie bars, interlocking means between said tiebars and said continuous bands, and lock bars passing through thealigned bands and the transverse tie bars for locking said bands to saidtie bars.

In testimony whereof I have afiixed my signature.

JOHN A. LUNDSTEAD.

